I had a bad crash on my RAID6 box, which seems to have dropped 2 disks
simultaneously...which has me nervous for obvious reasons. I have the
details from mdadm --examine for each raid member. I also included the
pertinent dmesg snippet.
My question is: Based on the Events (1197409 on /dev/sdb5 vs 1197411
for /dev/sdc thru sdf) and checksums...should I force reassemble/start
just sdc5/sdd5/sde5/sdf5, leave sda out altogether to start with and
sync in sdb? or can I safely start with 5 drives sdb/sdc/sdd/sde/sdf
and add sda back in right off?
Advice? Specific commands? New options?
Thanks!!!
==============================================================
/dev/sda5:
Magic : a92b4efc
Version : 00.90.03
UUID : ae3b47bd:ac100bfe:1bed3458:8d6915d8
Creation Time : Sun Dec 3 20:31:16 2006
Raid Level : raid6
Used Dev Size : 233874112 (223.04 GiB 239.49 GB)
Array Size : 935496448 (892.16 GiB 957.95 GB)
Raid Devices : 6
Total Devices : 6
Preferred Minor : 3
Update Time : Fri Sep 4 03:39:01 2009
State : active
Active Devices : 6
Working Devices : 6
Failed Devices : 0
Spare Devices : 0
Checksum : 4ae55bef - correct
Events : 1197409
Chunk Size : 64K
Number Major Minor RaidDevice State
this 4 8 5 4 active sync /dev/sda5
0 0 8 37 0 active sync /dev/sdc5
1 1 8 53 1 active sync /dev/sdd5
2 2 8 69 2 active sync /dev/sde5
3 3 8 85 3 active sync /dev/sdf5
4 4 8 5 4 active sync /dev/sda5
5 5 8 21 5 active sync /dev/sdb5
/dev/sdb5:
Magic : a92b4efc
Version : 00.90.03
UUID : ae3b47bd:ac100bfe:1bed3458:8d6915d8
Creation Time : Sun Dec 3 20:31:16 2006
Raid Level : raid6
Used Dev Size : 233874112 (223.04 GiB 239.49 GB)
Array Size : 935496448 (892.16 GiB 957.95 GB)
Raid Devices : 6
Total Devices : 6
Preferred Minor : 3
Update Time : Fri Sep 4 03:39:01 2009
State : active
Active Devices : 6
Working Devices : 6
Failed Devices : 0
Spare Devices : 0
Checksum : 4ae55c01 - correct
Events : 1197409
Chunk Size : 64K
Number Major Minor RaidDevice State
this 5 8 21 5 active sync /dev/sdb5
0 0 8 37 0 active sync /dev/sdc5
1 1 8 53 1 active sync /dev/sdd5
2 2 8 69 2 active sync /dev/sde5
3 3 8 85 3 active sync /dev/sdf5
4 4 8 5 4 active sync /dev/sda5
5 5 8 21 5 active sync /dev/sdb5
/dev/sdc5:
Magic : a92b4efc
Version : 00.90.03
UUID : ae3b47bd:ac100bfe:1bed3458:8d6915d8
Creation Time : Sun Dec 3 20:31:16 2006
Raid Level : raid6
Used Dev Size : 233874112 (223.04 GiB 239.49 GB)
Array Size : 935496448 (892.16 GiB 957.95 GB)
Raid Devices : 6
Total Devices : 6
Preferred Minor : 3
Update Time : Fri Sep 4 03:54:41 2009
State : active
Active Devices : 5
Working Devices : 5
Failed Devices : 1
Spare Devices : 0
Checksum : 4ae55fc4 - correct
Events : 1197411
Chunk Size : 64K
Number Major Minor RaidDevice State
this 0 8 37 0 active sync /dev/sdc5
0 0 8 37 0 active sync /dev/sdc5
1 1 8 53 1 active sync /dev/sdd5
2 2 8 69 2 active sync /dev/sde5
3 3 8 85 3 active sync /dev/sdf5
4 4 0 0 4 faulty removed
5 5 8 21 5 active sync /dev/sdb5
/dev/sdd5:
Magic : a92b4efc
Version : 00.90.03
UUID : ae3b47bd:ac100bfe:1bed3458:8d6915d8
Creation Time : Sun Dec 3 20:31:16 2006
Raid Level : raid6
Used Dev Size : 233874112 (223.04 GiB 239.49 GB)
Array Size : 935496448 (892.16 GiB 957.95 GB)
Raid Devices : 6
Total Devices : 6
Preferred Minor : 3
Update Time : Fri Sep 4 03:54:41 2009
State : active
Active Devices : 5
Working Devices : 5
Failed Devices : 1
Spare Devices : 0
Checksum : 4ae55fd6 - correct
Events : 1197411
Chunk Size : 64K
Number Major Minor RaidDevice State
this 1 8 53 1 active sync /dev/sdd5
0 0 8 37 0 active sync /dev/sdc5
1 1 8 53 1 active sync /dev/sdd5
2 2 8 69 2 active sync /dev/sde5
3 3 8 85 3 active sync /dev/sdf5
4 4 0 0 4 faulty removed
5 5 8 21 5 active sync /dev/sdb5
/dev/sde5:
Magic : a92b4efc
Version : 00.90.03
UUID : ae3b47bd:ac100bfe:1bed3458:8d6915d8
Creation Time : Sun Dec 3 20:31:16 2006
Raid Level : raid6
Used Dev Size : 233874112 (223.04 GiB 239.49 GB)
Array Size : 935496448 (892.16 GiB 957.95 GB)
Raid Devices : 6
Total Devices : 6
Preferred Minor : 3
Update Time : Fri Sep 4 03:54:41 2009
State : active
Active Devices : 5
Working Devices : 5
Failed Devices : 1
Spare Devices : 0
Checksum : 4ae55fe8 - correct
Events : 1197411
Chunk Size : 64K
Number Major Minor RaidDevice State
this 2 8 69 2 active sync /dev/sde5
0 0 8 37 0 active sync /dev/sdc5
1 1 8 53 1 active sync /dev/sdd5
2 2 8 69 2 active sync /dev/sde5
3 3 8 85 3 active sync /dev/sdf5
4 4 0 0 4 faulty removed
5 5 8 21 5 active sync /dev/sdb5
/dev/sdf5:
Magic : a92b4efc
Version : 00.90.03
UUID : ae3b47bd:ac100bfe:1bed3458:8d6915d8
Creation Time : Sun Dec 3 20:31:16 2006
Raid Level : raid6
Used Dev Size : 233874112 (223.04 GiB 239.49 GB)
Array Size : 935496448 (892.16 GiB 957.95 GB)
Raid Devices : 6
Total Devices : 6
Preferred Minor : 3
Update Time : Fri Sep 4 03:54:41 2009
State : active
Active Devices : 5
Working Devices : 5
Failed Devices : 1
Spare Devices : 0
Checksum : 4ae55ffa - correct
Events : 1197411
Chunk Size : 64K
Number Major Minor RaidDevice State
this 3 8 85 3 active sync /dev/sdf5
0 0 8 37 0 active sync /dev/sdc5
1 1 8 53 1 active sync /dev/sdd5
2 2 8 69 2 active sync /dev/sde5
3 3 8 85 3 active sync /dev/sdf5
4 4 0 0 4 faulty removed
5 5 8 21 5 active sync /dev/sdb5
=====================================================================
FROM dmesg:
[37156.420224] md: kicking non-fresh sdb5 from array!
[37156.420248] md: unbind<sdb5>
[37156.433033] md: export_rdev(sdb5)
[37156.433139] md: kicking non-fresh sda5 from array!
[37156.433149] md: unbind<sda5>
[37156.445036] md: export_rdev(sda5)
[37156.445085] md: md3: raid array is not clean -- starting background
reconstruction
[37156.468427] raid5: device sdf5 operational as raid disk 3
[37156.468434] raid5: device sdc5 operational as raid disk 0
[37156.468438] raid5: device sde5 operational as raid disk 2
[37156.468442] raid5: device sdd5 operational as raid disk 1
[37156.468446] raid5: cannot start dirty degraded array for md3
[37156.468452] RAID5 conf printout:
[37156.468455] --- rd:6 wd:4
[37156.468459] disk 0, o:1, dev:sdc5
[37156.468462] disk 1, o:1, dev:sdd5
[37156.468465] disk 2, o:1, dev:sde5
[37156.468468] disk 3, o:1, dev:sdf5
[37156.468471] raid5: failed to run raid set md3
[37156.468474] md: pers->run() failed ...
[38522.717405] raid5: device sdf5 operational as raid disk 3
[38522.717412] raid5: device sdc5 operational as raid disk 0
[38522.717417] raid5: device sde5 operational as raid disk 2
[38522.717421] raid5: device sdd5 operational as raid disk 1
[38522.717425] raid5: cannot start dirty degraded array for md3
[38522.717430] RAID5 conf printout:
[38522.717432] --- rd:6 wd:4
[38522.717435] disk 0, o:1, dev:sdc5
[38522.717439] disk 1, o:1, dev:sdd5
[38522.717442] disk 2, o:1, dev:sde5
[38522.717445] disk 3, o:1, dev:sdf5
[38522.717449] raid5: failed to run raid set md3
[38522.717452] md: pers->run() failed ...
--
"A man is defined by the questions that he asks; and the way he goes
about finding the answers to those questions is the way he goes
through life."
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